What are the two chips with silkscreen SI4GK and S551J?

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What are the two chips with silkscreen SI4GK and S551J? [Copy link]

There are two components, both in SOT23-5 package, one with silkscreen SI4GK and the other S551J. What chips are these two?

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Check on several silk screen reverse checking websites

电源芯片丝印反查型号

The chip reverse search website can only find some simple ones, and it can't find the difficult ones. Moreover, the system reverse search may not be accurate, because I often encounter the same silk screen and the same package but different models, so manual search can be accurate. But it is better to provide pictures so that you can see the pictures of the silk screen fonts.